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This unique prospective study allowed longitudinal assessment of severe childhood-onset attention/deficit-hyperactivity disorder (ADHD), without confounding by comorbid conduct disorder. Participants were 135 white men diagnosed at mean age 8 years with hyperactive/impulsive ADHD subtypes, but with few conduct-disorder symptoms, and 136 age-matched comparison men followed from age 18. At mean age 41, 65% of the ADHD group and 76% of the comparison group were reinterviewed. The control group assessed at age 41 had a significantly higher mean IQ than the baseline sample. Interviewers were masked to diagnosis.
Although median income among employed ADHD participants ($60,000) was higher than population norms, it was $40,000 lower than among cont…